Oxygen surface exchange properties of La0.6Sr0.4Co0.8Fe0.2O3 − δ coated with SmxCe1 − xO2 − δ

► Surface exchange coefficient has significantly increased for SDC coated LSCF. ► Surface exchange coefficient of SDC coated LSCF depends on the SDC loading. ► Exchange coefficient of SDC coated LSCF increases with ionic conductivity of SDC.